The sources of pig wastewater mainly include urine, manure and water produced during livestock and poultry breeding, which belongs to high concentration organic wastewater. If the wastewater is directly discharged into the surrounding water body without effective treatment, it will lead to eutrophication of the surrounding water body. Fungi and algae in the water will multiply, making the water body black and smelly due to hypoxia, which will cause the water body to lose its original use value, affect the environment around the water body, and reduce the value of the land around the water body.

1. COD, BOD5, NH3-N, P, SS are high, and contain a large amount of suspended matter such as pig manure.
2. It is a high concentration of organic wastewater. Since BOD; /COD>0.3, which can reach 0.6, which is easy to biodegrade, and this type of wastewater has good biodegradability, and the biochemical treatment method can achieve the ideal treatment effect.

Livestock and poultry sewage is characterized by high concentration of organic matter, suspended solids and ammonia nitrogen, unstable water quality, and most of the existing treatment methods have high operating costs, unstable treatment effects, and cannot meet the standard discharge.

   The source of pig wastewater mainly includes cleaning water from livestock and poultry farms. There are two types of manure cleaning processes used in farms: dry manure cleaning and water flushing. The pollution load of wastewater produced by water flushing manure is high, and the COD is high
2000mg/L, NH3-N average 600mg/L; The pollution concentration of dry manure is relatively low, with COD as high as 2500-3000mg/L, but the pollutant content is also very high.

        Solid-liquid separation is the basis of wastewater treatment for livestock breeding. Due to the high SS, it is necessary to set up a pretreatment process before biochemistry to remove most of the solid matter to reduce the load of subsequent treatment. For liquid livestock and poultry manure wastewater, anaerobic I art should be used for harmless treatment, so anaerobic digestion is a widely used wastewater treatment process in livestock and poultry farms.      Organic wastewater treatment technology has been developed for a long time, and a variety of treatment technologies and process routes have been formed, generally with the main purpose of removing organic matter. For higher concentrations of organic matter nitrogen-containing wastewater
The more mature method is to use UASB-anoxic-aerobic treatment process (A2-0 method), which can ensure high COD, removal rate, and have a certain nitrogen and phosphorus removal effect. And treated with hypoxia
The effluent contains more reducing substances and insufficiently degraded organic matter, which needs to be further treated, and aerobic biological treatment can stably meet the discharge standards of the anoxic effluent.
Aerobic biochemical treatment can generally be divided into activated sludge method and biofilm method (contact oxidation) according to the state of microbial survival. The advantage of the traditional contact oxidation method is that the operation management is simpler, but the disadvantage is
The packing bracket needs to be stopped for maintenance on a regular basis.
      In addition, pig wastewater treatment also needs to choose the appropriate treatment process according to its treatment destination, which is simply divided into:
(1) The influent water quality concentration is low, and the effluent is used for agricultural fertilization: sand sediment + anaerobic harmless treatment
(2) High influent water quality concentration, effluent is used for agricultural fertilization: sand sedimentation + solid-liquid separation + anaerobic harmless treatment
(3) High concentration of influent water quality and effluent discharge: sedimentation + solid-liquid separation + anaerobic harmless treatment + aerobic treatment + natural treatment + disinfection
(4) Other uses